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Preparation method of lithium vanadium phosphate positive electrode material

A positive electrode material, lithium vanadium phosphate technology, applied in the field of lithium ions, can solve the problem of discharge specific capacity decline and other issues

Pending Publication Date: 2021-07-06
天津斯科兰德科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The obtained cathode material has a charge-discharge specific capacity of up to 173mAh g at 0.1C -1 , but the specific discharge capacity drops significantly at 5C

Method used

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  • Preparation method of lithium vanadium phosphate positive electrode material
  • Preparation method of lithium vanadium phosphate positive electrode material
  • Preparation method of lithium vanadium phosphate positive electrode material

Examples

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preparation example Construction

[0027] Embodiments of the present invention provide a method for preparing a lithium vanadium phosphate positive electrode material, comprising the following steps:

[0028] 1) the NH 4 VO 3 , LiOH, NH 4 h 2 PO 4 and glucose by mass ratio NH 4 VO 3 :LiOH:NH 4 h 2 PO 4 : Glucose = 100: (30-40): (145-155): (27.5-29.5) was added to 800-1200mL deionized water, heated in a water bath at 60-80°C, and the stirring speed was 400-800r·min -1 , stirred for 30-60min to make a slurry;

[0029] 2) Pass the slurry into the spray dryer and atomize and spray it out to obtain the precursor, wherein the air inlet temperature of the spray dryer is controlled at 200-300°C, the outlet air temperature is controlled at 80-100°C, and at the same time, the Send dry air flow in the direction, the direction of the air flow is the same as the direction in which the solution is ejected;

[0030] 3) Collect and weigh the prepared precursor, weigh 6%-8% of the weight of the precursor, and mix it ...

Embodiment 1

[0034] Take 200g analytically pure NH 4 VO 3 , 60g of LiOH, 295g of NH 4 h 2 PO 4 and 55.5g of glucose were added to 800mL of deionized water, and the temperature of the water bath was controlled at 60°C and stirred for 45min to obtain a slurry.

[0035] The resulting slurry is atomized and sprayed out through a spray dryer. Under the action of air flow, the precursor is obtained in the collecting device.

[0036] The obtained precursor was weighed. Then, 6% glucose by weight of the precursor was weighed and mixed. Put the mixture in a continuous sintering furnace, pass in protective gas for 0.5h, exhaust the air in the sintering furnace, and sinter at 650°C for 6h to obtain Li 3 V 2 (PO 4 ) 3 . Grind for later use.

Embodiment 2

[0038] Take 200g analytically pure NH 4 VO 3 , 70g of LiOH, 300g of NH 4 h 2 PO 4 and 57g of glucose were added into 1200mL of deionized water, and the temperature of the water bath was controlled at 60°C and stirred for 60min to obtain a slurry.

[0039] The resulting slurry is atomized and sprayed out through a spray dryer. Under the action of air flow, the precursor is obtained in the collecting device.

[0040] The obtained precursor was weighed. Then weigh 7% of the precursor mass of glucose for mixing, put the mixture in a continuous sintering furnace, pass through a protective gas for 0.5h, exhaust the air in the sintering furnace, and sinter at 650°C for 7h to obtain Li 3 V 2 (PO 4 ) 3 . Grind for later use.

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Abstract

The invention discloses a preparation method of a lithium vanadium phosphate positive electrode material. The preparation method comprises the following steps: 1) adding NH4VO3, LiOH, NH4H2PO4 and glucose into a certain amount of deionized water according to a certain mass ratio, heating in a water bath to 60-80 DEG C, and stirring to prepare slurry; (2) introducing the slurry into a spray dryer, atomizing and spraying to obtain a precursor, meanwhile, feeding dry airflow in the tangential direction of a spray head, wherein the airflow direction is the same as the solution spraying direction; 3) collecting and weighing the prepared precursor, weighing glucose accounting for 6-8% of the mass of the precursor, mixing the glucose with the precursor, then putting the mixture into a continuous sintering furnace, sintering for 6-8 hours under the protection of nitrogen at the sintering temperature of 600-800 DEG C, and pre-introducing nitrogen before sintering to ensure an oxygen-free environment; and 4) naturally cooling the sintered positive electrode material, crushing, grinding and sieving to form the final product. The lithium vanadium phosphate has good electrochemical stability, energy consumption is saved, and the lithium vanadium phosphate is safe, stable in quality and uniform in physical property.

Description

technical field [0001] The invention belongs to the technical field of lithium ions, and in particular relates to a method for preparing a lithium vanadium phosphate cathode material. Background technique [0002] Lithium-ion batteries have become the secondary battery system with the best comprehensive performance in new energy storage devices due to their high specific capacity, excellent cycle performance, and high power density. As the core and key technology of lithium-ion batteries, electrode materials determine the overall performance of lithium-ion batteries. At present, LiCoO has been widely used as a cathode material for lithium-ion batteries. 2 , LiMn 2 o 4 , LiNiO 2 , ternary materials, lithium-rich materials, LiFePO 4 and Li(FeMn)PO 4 Wait. Among these materials, phosphate cathode materials have attracted much attention due to their stable electrochemical performance and long cycle life. [0003] Compared to LiFePO 4 The positive electrode material can ...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58H01M10/0525
CPCC01B25/45H01M4/5825H01M10/0525H01M2004/028C01P2006/40C01P2004/61Y02E60/10
Inventor 李积刚
Owner 天津斯科兰德科技有限公司
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